Emergency-clutch.



A. L. DB LEEUW.

EMERGENCY CLUTCH.

APPLICATION FILED 001 .4, 1909.

Patented Aug. 13, 1912.

UNITED STATES PATENT OFFICE.

ADOLPE L. BE LEEUW, OF HAXILTGN, OHIO, ASSIGNOB TO THE CINCINNATI MILLING MACHINE COIFANZ', {BF CINCINNATI, OHIO, A CORPORATION OF OHIO.

EMERGENCY-CLUTCH.

peeiflcatlor. of Letters Intent.

Patented Aug. 13,1912.

Application. filed Gotcha! 4, 1909. Serial No/WOJM.

' elements, a normally'engaging clutch, disconnected under abnormal conditions, and with means for regulating'the-resistahce of the clutch with relation to the resistance of the work. This errfn'ts the clutch to be set to produce a pre ctermined maximum work capacity for the tool, so that when this strain is exceeded from any cause, the clutch will be automatically disengaged and the machine effectually, insured a ainst possible injury, resulting from acci ents or from the application of any excessive strain.

This clutch is positive in character for all normal use of the machine, but becomes friction in character upon the application of abnormal strains.

The clutch engaging elements are formed with a view to substantially instantaneous disengagement, when the strain exceeds a predetermined degree, as a continued move ment of the work-holding member, after the application of the excessive strain, would be disastrous.

The features of the invention are more fully set forth in the description of the accompanyng drawings, forming a part of this specification, in which Figure l is a side elevation of the milling machine, containing my improvement. F1 g. 2 is an enlarged section on line :23, m, Fig. l. Fig. 3 is an elevation of the emergency clutch shown in the section Fig. 2.

As illustrated in the drawin s, I have shown my improvement as app ied to the feed for the carriage and knee of a milling machine, but it is obvious that the same is applicable to various noes em loying the rotary driving means 'in whic it is desirablc to automatically cut ofi the power when undue strain or resistance is brought upon the driven element.

1 represents the driving shaft, and, as illustrated, applied to a milling mach ne,

provided with universal connections through the intermediate driving shaft Beo- :1

tion 2 with the shaft 3 journnled m the mid? I frame of the machine; This being a com mon construction employed in transmitting power from the main frame of the machine to the vertically movable knedq lhe shaft 1 is journaled in bearings 4, 5.

6 represents a sleeve clutch member in connection with the driving shaft by mm than the diameter binding strain, and affording a very free movementto the sleeve.

10 represents a sleeve clutch member, 08 end of which is tapered clutch-teethv of fine pitch, adapted to normally enga e with the similar clutch teeth on the clutc member 6. 11 represents a sleeve loosev on shaft 1 provided with the igears 12, and 13, formed" integrally-therew for transmitting mo,- tion to the various parts of'the machine, and at varying speeds or otherwise, and the whole as a gear element is conhected to the sleeve clutc member 10. This connection provided with shallow of a pin 7 passing'through a bore formed in ing preferably of 7.0 project min a,

is of clutch tooth type, in which the sleeve 11 is provided with one or more sockets,

adapted to receive the tooth or teeth 20.

14, 15 represent washer bearing rin s, and

16 represent intermediate balls, sea

posite end bears upon the collar.18 adjustwithin an offset formed in the bearing sleeve 10:

ably mounted upon the shaft '1, thus forming meansvt'or pettetermining the limit of power whichcan be conveyedto the driven element, to maintain a normal connection between the two clutch members, and if'undue'mesistance is brought upon said driven element beyond the expansive tension of the spring, the two clutch members Will slip upon each other, discontinuing the motion of the driven element. This connection of drive is highl advantageous in machine tools of the typeot milling machines, HI that it prevents feeding the work to the tool un- I (let too harsh a cut, or feeding the work against a dead-stop orsubjecting the machine to serer'er strains than it was designed The tension of the spring 17 may be adjusted to maintain the or built tofwithstaudl clutch member indriving connection under a normal usage of the machine. Having describedmymventiomlelann In combination with a driving member,

and a driven member of a n'iachiue tool, an

ing shallow tapered clutch teeth of fine 30 pitch, adapted to normally engage with each other, means for maintaining a fixed limit of resistance against said secondclutch memr her, and means for connecting said second clutch and'driving members, eomprislng a 35 pin loosely projected through the driving member each end thereof provided with ananti-friction roller, each engaging within a notch. formed in said second clutch member.

in testimony whereof, I have hereunto set my hand. I

ADOLPII 1m L'IGEU-W.

Witnesses:

OLIVER B. Kaiser, EM MA 'SPEXEIL, 

